EFi or SEFi

I believe that on EFI, all the injectors are opened at the same time, once per revolution of the engine I think, whereas SEFI (Sequential EFI) opens each injector individually during the induction stroke of that particular cylinder. Therefore SEFI should be better, because the fuel is always injected into flowing air so it should mix better.

In news:cbi1dk$qlb$ snipped-for-privacy@titan.btinternet.com, James slebbered:

So my SEFi Zetec engine that doesn't have the big EFi cover over the throttle body / inlet manifold area should be better than those that do?

Ta,

Graham

No, all the Zetec E engines with EEC 4 and 5 management (from 91 to date) run sequential injection. (most of the time*)

• too many to list, but in a nutshell- non sequential over 5000rpm, and do two injections per crankshaft revolution, coolant temps below ~50 degrees, and below 600rpm, during cranking (again 2 pulses per rev) or when battery voltage drops below 12.3 volts.

Tim..

Hi Graham

The Mondeo is Dual mode, it runs in batch mode (2 x 1/2 squirts per cylinder per RPM) up to 3000 RPM, and then switches to sequential, (1 squirt per Cylinder per RPM)

See above- it switches back to batch firing under full load too.

Tim..